What do you need to be aware of when defining data transfer?

You are creating advanced copy operators as part of an SAP IBP solution that is being implemented.

What do you need to be aware of when defining data transfer? Note: There are 2 correct Answers to this question.
A . Specifying target key figure is mandatory.
B . Specifying target key figure that is time independent is possible.
C . Specifying source key figure is mandatory.
D . Selecting by attribute with option ‘contain’ is possible.

Answer: A, C